ANALOG DEVICES AD8253 Service Manual

现货库存、技术资料、百科信息、热点资讯，精彩尽在鼎好!

10 MHz, 20 V/μs, G = 1, 10, 100, 1000 i CMOS®

Programmable Gain Instrumentation Amplifier

Preliminary Technical Data

FEATURES

Small package: 10-lead MSOP Programmable gains: 1, 10, 100, 1000 Digital or pin-programmable gain setting Wide supply: ±5 V to ±15 V

Excellent dc performance

High CMRR 120 dB , G = 100 Low gain drift: 10 ppm/°C Low offset drift: 1.2 V/°C , G = 1000

Excellent ac performance

Fast settling time: 615 ns to 0.001% High slew rate: 20 V/µs Low distortion: High CMRR over frequency: 80 dB to 50 kHz Low noise: 8 nV/√Hz, G = 1000 Low power: 4 mA

APPLICATIONS

Data acquisition Biomedical analysis Test and measurement

GENERAL DESCRIPTION

The AD8253 is an instrumentation amplifier with digitally programmable gains that has GΩ input impedance, low output noise, and low distortion making it suitable for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs). It has high bandwidth of 10 MHz, low THD and fast settling time of 615 ns to 0.001%. Offset drift and gain drift are specified to 1.2 μV/°C and 10 ppm/°C, respectively for G = 1000. In addition to its wide input common voltage range, it boasts a high common-mode rejection of 80 dB at G = 1 from dc to 50 kHz. The combination of precision dc performance coupled with high speed capabilities make the AD8253 an excellent candidate for data acquisition. Furthermore, this monolithic solution simplifies design and manufacturing, and boosts performance of instrumentation by maintaining a tight match of internal resistors and amplifiers.

The AD8253 user interface consists of a parallel port that allows users to set the gain in one of two different ways (see Figure 1 for the functional block diagram). A 2-bit word sent via a bus

can be latched using the transparent gain mode where the state of logic levels at the gain port determines the gain.

input. An alternative is to use

AD8253

FUNCTIONAL BLOCK DIAGRAM

DGD

-IN

+IN

+VS -VS REF

Logic

Figure 1.

Table 1. Instrumentation and Difference Amplifiers by Category

High Performance

AD82201 AD6231 AD8221 AD8222 AD524 AD8251 AD82241

AD624

Rail-to-rail output.

Low Cost

AD8553

High Voltage

AD628 AD620

AD629 AD621 AD8250

The AD8253 is available in a 10-lead MSOP package and is specified over the −40°C to +85°C temperature range, making it an excellent solution for applications where size and packing density are important considerations.

AD8253

Mil Grade

AD526

A1 A0

OUT

Low Power

AD6271 AD82311

Digital Gain

AD85551 AD8556 AD8557

Rev. prA

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

AD8253 Preliminary Technical Data

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Diagram........................................................................... 5

Absolute Maximum Ratings............................................................ 6

REVISION HISTORY

4/07—Revision 0: Initial Version

Maximum Power Dissipation......................................................6

ESD Caution...................................................................................6

Pin Configuration and Function Descriptions..............................7

Theory of Operation .........................................................................8

Gain Selection................................................................................8

Outline Dimensions....................................................................... 10

Ordering Guide .......................................................................... 10

Rev. prA | Page 2 of 10

Preliminary Technical Data AD8253

SPECIFICATIONS

+VS = +15 V, −VS = −15 V, V

Table 2.

Parameter Conditions Min Typ Max Unit

COMMON-MODE REJECTION RATIO (CMRR)

CMRR to 60 Hz with 1 kΩ Source Imbalance +IN = −IN = −10 V to +10 V

G = 1 80 dB G = 10 100 dB G = 100 120 dB G = 1000 120 dB

CMRR to 50 kHz +IN = −IN = −10 V to +10 V

G = 1 80 dB G = 10 dB G = 100 dB G = 1000 dB

NOISE

Voltage Noise, 1 kHz, RTI

G = 1 40 nV/√Hz G = 10 9 nV/√Hz G = 100 8 nV/√Hz G = 1000 8 nV/√Hz

0.1 Hz to 10 Hz, RTI G = 1 2.5 μV p-p G = 10 2.5 μV p-p G = 100 μV p-p G = 1000 μV p-p

Current Noise, 1 kHz 5 pA/√Hz Current Noise, 0.1 Hz to 10 Hz 60 pA p-p

VOLTAGE OFFSET

Offset RTI VOS G = 1, 10, 100, 1000 ±200 + 600/G μV

Over Temperature T = −40°C to +85°C ±260 + 900/G μV Average TC T = −40°C to +85°C ±1.2 + 5/G μV/°C

Offset Referred to the Input vs. Supply (PSR) VS = ±5 V to ±15 V ±6 + 20/G μV/V

INPUT CURRENT

Input Bias Current 5 30 nA

Over Temperature T = −40°C to +85°C 40 nA Average TC 400 pA/°C

Input Offset Current 5 30 nA

Over Temperature T = −40°C to +85°C 30 nA Average TC 160 pA/°C

DYNAMIC RESPONSE

Small Signal −3 dB Bandwidth

G = 1 10 MHz G = 10 6 MHz G = 100 3 MHz G = 1000 0.3 MHz

Settling Time 0.01% ΔOUT = 10 V step

G = 1 585 ns G = 10 648 ns G = 100 ns G = 1000 ns

= 0 V @ TA = 25°C, G = 1, RL = 2 kΩ, unless otherwise noted.

REF

Rev. prA | Page 3 of 10

+ 7 hidden pages